Founded in 2015
Faculty of the Built
Environment & Architecture
TU Delft, the Netherlands
Brief overview
Slide 3
Slide 3 text
The team
Slide 4
Slide 4 text
Our (over-the-top) website
Slide 5
Slide 5 text
Urban environment and 3D geoinformation
Our focus
Slide 6
Slide 6 text
6
Whole North Rhine-
Westphalia:
10M+ LoD2 buildings
More and more 3D data from cities
Slide 7
Slide 7 text
New York City
More and more 3D data from cities
Slide 8
Slide 8 text
8
Helsinki: with
textures
More and more 3D data from cities
Slide 9
Slide 9 text
9
Whole of the
Netherlands in LoD2.2
More and more 3D data from cities
Slide 10
Slide 10 text
Why 3D geoinformation?
Slide 11
Slide 11 text
solar potential
shadow analysis
noise modelling
energy estimation
bomb detonation
wind turbulence
pollutant tracking
Slide 12
Slide 12 text
12
3D use in mainstream media: NY Times
https://www.nytimes.com/interactive/2016/12/21/upshot/Mapping-the-Shadows-of-New-York-City.html
Slide 13
Slide 13 text
Some projects
Slide 14
Slide 14 text
https://3dbag.nl all 10M+ buildings in the Netherlands
Point cloud
(AHN3)
Footprint (BAG)
+
X 10,000,000
100% automatic
Slide 15
Slide 15 text
15
Slide 16
Slide 16 text
https://3dbag.nl
• Collaborations between https://3dgi.nl and us
• Whole workflow is (will be soon!) 100% open-source
• Roofer: C++ library for LoD2.2 reconstruction
• Pipeline from raw data to buildings in DBMS + CityJSON
Slide 17
Slide 17 text
Another 3D reconstruction: City3D!
Airborne LiDAR LoD2 building model
Slide 18
Slide 18 text
Highly-detailed reconstruction
3D trees from laser scanning
3D buildings from drones
Check our
website for code!
Slide 19
Slide 19 text
AI for understanding 3D textured meshes
Funded by
Cyclomedia
Slide 20
Slide 20 text
Semantic segmentation of 3D meshes
Slide 21
Slide 21 text
Semantic segmentation of 3D meshes
Slide 22
Slide 22 text
Quality control of 3D city models
Automatic repairing of broken 3D city
With my colleague John Zhao, we’re making an overview
of the most common errors/problems, such as:
12
http://geovalidation.bk.tudelft.nl/val3dity/
Slide 23
Slide 23 text
Wind simulation in cities
Slide 24
Slide 24 text
City4CFD: reconstruct CFD input automatically
Only open-source
software is used
OpenFOAM
Slide 25
Slide 25 text
LoD1.2
LoD2.2
UAV safety maps over urban environments
Slide 26
Slide 26 text
SCIENCES, Marie Curie grant
Energy and CFD modelling to minimize energy usage
Slide 27
Slide 27 text
No content
Slide 28
Slide 28 text
28
• community standard
• compliant with CityGML v3.0
• subset of CityGML (~90% of features)
• software for full conversion CityGML <-> CityJSON
• several software support CityJSON
new!
CityJSON v2.0
Slide 29
Slide 29 text
29
CityGML = 3.0GB
(but 1GB of spaces/CRs/tabs!)
CityJSON = 292MB
Compression of files: Zürich LoD2 buildings
Slide 30
Slide 30 text
GeoBIM integration
Slide 31
Slide 31 text
31
Slide 32
Slide 32 text
32
RhinoCityJSON
Slide 33
Slide 33 text
33
● Generaties City models’ geometries and
attributes in BIM environment
● Reprojecting and translating data based on
metadata and coordination referencing
systems (CRS)
● Available at Autodesk App Store as a free
featured app
CityJSON importer for Autodesk Revit
Slide 34
Slide 34 text
➡ h.ledoux@tudelft.nl
➡ https://3d.bk.tudelft.nl
more info than you probably need!
projects, papers, code, etc
2 courses are open (book+YouTube):
• terrain modelling (AHN4)
• 3D modelling for the built environment
Thank you